28949551 has 4 divisors (see below), whose sum is σ = 29074032. Its totient is φ = 28825072.

The previous prime is 28949539. The next prime is 28949573. The reversal of 28949551 is 15594982.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28949551 - 2⁵ = 28949519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28949498 and 28949507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28949581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61891 + ... + 62356.

It is an arithmetic number, because the mean of its divisors is an integer number (7268508).

Almost surely, 2^28949551 is an apocalyptic number.

28949551 is a deficient number, since it is larger than the sum of its proper divisors (124481).

28949551 is a wasteful number, since it uses less digits than its factorization.

28949551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124480.

The product of its digits is 129600, while the sum is 43.

The square root of 28949551 is about 5380.4786961756. The cubic root of 28949551 is about 307.0534236304.

The spelling of 28949551 in words is "twenty-eight million, nine hundred forty-nine thousand, five hundred fifty-one".